Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-30T20:38:47.742Z Has data issue: false hasContentIssue false
  • English
  • Français

Structural Studies of Hydrogen Storage Alloys using X-ray/Neutron Diffraction and Total Scattering

Published online by Cambridge University Press:  22 August 2011

Yumiko Nakamura ,
Hyunjeong Kim ,
Saishun Yamazaki ,
Kouji Sakaki ,
Thomas Proffen  and
Etsuo Akiba
Yumiko Nakamura
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
Hyunjeong Kim
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
Saishun Yamazaki
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
Kouji Sakaki
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
Thomas Proffen
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM87545, USA
Etsuo Akiba
Affiliation:
National Institute of Advanced Industrial Science and Technology, AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
Get access

Abstract

Crystal and local structures and hydrogen occupation of Mg containing materials, (Mg,Ca)Nix (x = 2, 3) intermetallic compounds and a MgCo metastable alloy, have been investigated using in-situ and ex-situ X-ray/neutron diffraction and total scattering.

A C15 Laves phase (Mg0.67Ca0.33)Ni2 showed isotropic lattice expansion upon hydrogenation. Mg and Ca occupied the same site randomly. It has two hydrogen sites, Mg(Ca)2Ni2 site and M(Ca)Ni3 site.

Mg2CaNi9, MgCa2Ni9, and CaNi3 compounds consisted of MgZn2-type (Mg,Ca)2Ni4 cell and CaCu5-type CaNi5 cell stacking along the c-axis. The MgZn2-type cell was occupied by only Mg in Mg2CaNi9, and randomly occupied by both Mg and Ca in MgCa2Ni9. Expansion of this cell strongly depended on the composition: larger expansion was observed in a Ca-rich composition.

Local structure of a Mg-Co alloy synthesized by mechanical alloying has been studied using the PDF (Pair Distribution Function) method. The analysis suggested that material contained two 1-2 nm domains with different compositions and local structures, i.e. Mg-rich and Co-rich domains, and hydrogen was located only in the Mg-rich domain.

Keywords

hydrogenationalloyenergy storage
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1334: Symposium N – Recent Developments in Materials for Hydrogen Storage and Carbon-Capture Technologies , 2011 , mrss11-1334-n02-06
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Hirose, K., Phil. Trans. R. Soc. A 368, 3365 (2010).Google Scholar
2. Izumi, F. and Ikeda, T., Mater. Sci. Forum 321–324, 198 (2000).10.4028/www.scientific.net/MSF.321-324.198Google Scholar
3. Larson, A.C. and Von Dreele, R.B., Los Alamos National Laboratory Report, LAUR 86–748 (1994).Google Scholar
4. Kim, H., Nakamura, J., Shao, H., Nakamura, Y., Akiba, E., Chapman, K., Chupas, P., Proffen, T., J. Phys. Chem. C 115, 7723 (2011).Google Scholar
5. Peterson, P. F., Gutmann, M., Proffen, Th., Billinge, S. J. L., J. Appl. Crystallogr. 33, 1192 (2000).Google Scholar
6. Qiu, X., Thompson, J. W., Billinge, S. J. L., J. Appl. Crystallogr. 37, 678 (2004).Google Scholar
7. Farrow, C. L., Juhas, P., Liu, J. W., Bryndin, D., Božin, E. S., Bloch, J., Proffen, Th., Billinge, S. J. L., J. Phys. Condens. Matter 19, 335219 (2007).Google Scholar
8. Terashita, N., Kobayashi, K., Sasai, T., Akiba, E., J. Alloys Compd. 327, 275 (2001).Google Scholar
9. Oesterreicher, H., Ensslen, K., Kerlin, A. and Bucher, E., Mat. Res. Bull. 15, 275 (1980).Google Scholar
10. Zhang, Y., Tsushio, Y., Enoki, H., Akiba, E., J. Alloys Compd. 393, 147 (2005).Google Scholar
11. Matsuda, J., Shao, H., Nakamura, Y., Akiba, E., Nanotechnology 20, 204015 (2009).Google Scholar
12. Zolliker, P., Yvon, K., Fischer, P., Schefer, J., Inorg. Chem. 24, 4177 (1985).Google Scholar